線程死鎖演示，線程鎖演示,模擬JVM的線程次序調度

模擬JVM的線程次序調度

注釋A，不注釋B，一般不死鎖

注釋B，不注釋A，死鎖

都不注釋，隨機package org.he.bin;/** * @author BenHe * @email qing878@gmail.com * @for description dead lock */public class DeadLock extends Thread { private boolean threadFlag; private Object lock1 ; private Object lock2 ; public DeadLock(boolean threadFlag,Object lock1,Object lock2) { this.threadFlag = threadFlag; this.lock1=lock1; this.lock2=lock2; } @Override public void run() { try { if (threadFlag) methodA(); else methodB(); } catch (InterruptedException e) { System.out.println(e.getMessage()); } } void methodA() throws InterruptedException { synchronized (lock2) { Thread.sleep(10); // point A System.out.println(this.getName()+":lock lock2"); System.out.println(this.getName()+":wait for lock1"); synchronized (lock1) { System.out.println(this.getName()+":in methodA"); } } } void methodB() throws InterruptedException {// Thread.sleep(10); //point B synchronized (lock1) { System.out.println(this.getName()+":lock lock1"); System.out.println(this.getName()+":wait for lock2"); synchronized (lock2) { System.out.println(this.getName()+":in methodB"); } } } /** * @param args */ public static void main(String[] args) { Object lock1 = new Object(); Object lock2 = new Object(); new DeadLock(true,lock1,lock2).start(); new DeadLock(false,lock1,lock2).start(); }}//該片段來自于http://byrx.net

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